Anzesthetizer



Feb. v22.,v 1932. G, J. BRETT 1,846,834

ANESTHETIZER Filed Sept. 29, 1928 I5'sfrenata-Sheet l Afro/iwf. i

Feb. 2,3, 1932. G, J, BRETT 1,846,834

ANZESTHETIZER Filed Sept. 29, 1928 3 Sheets-Sheet 2 Y Fel), 23, 1932. G, J, BRETTv l 1,846,834

ANESTHETIZER Filed sept. 2, 1928 s sheets-sheet 3 Patented Feb. a3, 1932 l UNiTEo STATES GEORGE J. BRETT, or LANCASTER, rnnnsftvama Amas'.rianrrznny l Application ined september 29,' i928. semaine. 369,345. p k

To these and other ends hereinafter setV forth or appearing the invention may be said to comprise the improvements hereinafter described, and also an anaesthetizer having two sets of valves arranged in series and of which one is to be set to fix the percentage of nitrous oxide and of oxygen in the mixture,.and of which the other is adapted to control the quantity per unit of time of the mixture administered gradually and according to the symptoms of the patient and in order to avoid subjecting the patient to what might be called sudden shocks.

In the following description reference will be made to the accompanying drawing forming part hereofand inwhich Figure 1 is a plan view of an anaesthetizer embodying features of the invention and showing the same mounted upon a pedestal or stand.

Fig. 2 is a side view partly in section of the top portion of the same.

v Fig. 3 is a front view of the panel or table drawn to an enlarged scale.

Fig. 4 is a sectional view taken generally on the line 4 4 ofFig. 3.

Fig. 5 is an edge view of the table looking from right to left in Fig. 3, and l Fig. 6 is a rear view of the table shown Vin Fig. 3. y

1 is a stand'having vertically adjustable arms 2 to which the table, generally indicated at 3', is pivoted. The stand accommodates the tank 4 for oxygen and the tank ,5 for nitrous oxide. Referring more particularly to Fig. 6, 6 is 'a nitrous oxide gas inlet con- 59 nection, and 7 is an oxygen gas inlet conneclistering gas to the patient. z 13 is* a mixer land tion. There is anioutlet `connection I' Ving a connection 9 for'th'e .bag 10. The outlet connection. is provided vwithaivali'fe 11 and Vis shownas -tted with Vmeans 125foradminit includes {alvalve operated-bythe lever14, and this lever operated valve controls'the volume of regulatedgas by `number of gallons liow per unit `of timeto the respiratory reservoir 15, which is provided with heater tolreepthe ltemperatureof the gas constant,

and with la gauge 16 whichwserves to show i the pressure inthe reservorgand to indicatev the pressure inthe bag10.'l`he oxygen'connection includes afpipe 17 having a' normally closed vvalve 18 thereinandleadingldirect y to the .outlet The oxygen -connectionalso includes" a .branch pipea19leading Atogjthe mixer 1 3 andincluding .a pressure regulator 20 havingv fa gauge and alsoxscrewymeansg21 which operateithe oxygenvalvel provided :by the regulator." y j The)'nitrousjjoxide connection includes a pipe 22 leading direct to the reservoir 15 and including a normally closed valve 23. The nitrous oxide connection also includes the Vbranch pipe 24 leading tov the mixer 13 and j including a pressure regulator 25 `having a gauge 26. y The-valves 2O and 25 control the individual percentage ofgases in the'mixture. l f

It may be remarked that valves 20 and 25 are intended to be set to fix the percentage ofv gases in the mixture administered to the patient, and that there is another valve 13 operatedv by the )lever 14 for controlling the l" Y volume ofrthe mixture administered tok the -patient The use ofthe apparatus for anaesthetizing a patientmay be describedras follows:

rlhe pressure regulators 25 and 20 may be set to deliver a mixture of oxygen and nitrous oxide in appropriate proportions,-

trolling the volume of the mixture as` the m0 symptoms require, and the control may be made gradual in order to avoid shocks to the patient. The valves 18 and 23 may be regarded as emergency valves and used in case of necessity for administering additional volumes of nitrous oxide or oxygen. y t From 'the foregoing description it is evident that the described aneesthetizerh in its use depends principallyk upon the symptoms 'Y exhibited by the patient and that'the latter is not subjected to sudden shocks but is vgradually and properly aneesthetized.

It Will be obvious .to those skilled in the artto .which the invention relates'that modi- -ications may be made in details of construction vand arrangement and matters of mere ormWithout departing from the spirit of the invention which is not limited to such matters or otherwise than the prior art and .the appended claim may require.

I'claim: fg Y yAn anaeesthetizer including infcombination a mixer, valve means for supplying oxygen and nitrous oxiderespectivelyin regulated proportions to the m1xer,a resplrator reservoir 1n communication With the mixer; an

Voutlet inoludingvla bag,both bag and outlet Vbeing in Acommunication With the lrespirator reservoir, av Valve for regulating the quantity'per unit of timeof mixture delivered from the mixer to the respirator reservoir,

'a pressure gauge on therespirator reservoir, a by-passvnitrous oxide connection to the respirator reservoir for diluting the mixture 4 thereimand a by-pass oxygen connection to the outlet. V l

' GEORGEy J. BRETT. 

